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We present a study of the Angular Resolution of the AGILE gamma-ray imagingdetector (GRID) that is operational in space since April 2007. The AGILEinstrument is made of an array of 12 planes each equipped with a Tungstenconverter and Silicon micros trip detectors and is sensitive in the energyrange 50 MeV - 10 GeV. Among the space instruments devoted to gamma-rayastrophysics, AGILE uniquely exploits an analog readout system with dedicatedelectronics coupled with Silicon detectors. We show the results of Monte Carlosimulations carried out to reproduce the gamma-ray detection by the GRID, andwe compare them to in-flight data. We use the Crab (pulsar + Nebula) system fordiscussion of real data performance, since its E^{-2} energy spectrum isrepresentative of the majority of gamma-ray sources. For Crab-like spectrumsources, the GRID angular resolution (FWHM of ~4deg at 100 MeV; ~0.8deg at 1GeV; ~0.9deg integrating the full energy band from 100 MeV to tens of GeV) isstable across a large field of view, being characterized by a flat response upto 30deg off-axis. A comparison of the angular resolution obtained by the twooperational gamma-ray instruments, AGILE-GRID and Fermi-LAT, is interesting inview of future gamma-ray missions, that are currently under study. The twoinstruments exploit different detector configurations affecting the angularresolution: the former being optimized in the readout and track reconstructionespecially in the low-energy band, the latter in terms of converter thicknessand power consumption. We show that, despite these differences, the angularresolution of both instruments is very similar between 100 MeV and a few GeV.

On the Angular Resolution of the AGILE gamma-ray imaging detector